The ignition battery is a seperate battery that must be kept at least 12" away from the reciever. You always want at least 2 methods of killing a gas engine. I use 3 - choke on servo, radio transmitter kill, and fiber optic. That way if something happens to throttle servo you have a backup and a manual choke doesn't do you any good up in the air. If this is your first gasser, there are a lot of things to learn. What type of plane and which motor are you using. You only need an ignition battery if the motor has an electronic ignition. If the motor has a magneto like the Zenoah's then there is no battery.

R/C Foolish